Lifting-jack



(No Model.)

W. B. CARPENTER.

LIFTING JACK.

Patented Attorney Nv FETKRS. mew-Litho ra her. Wanmugmn. n.c

UNrTEn STATES PATENT QFFICEQ \VARD B. CARPENTER, OF WEST TOPSHAM, VERMONT, ASSIGNOR OF ONE- HALF TO J OHNR. ABBE, OF MANCHESTER, NEW HAMPSHIRE.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 293,946, dated February 19, 1884.

Application filed November 30, 1883. (No model.) I i To all whom it may concern Be it known that I, WARD B. CARPENTER, of Vest Topsham, in the county of Orange and State of Vermont, have invented certain new and useful Improvements in Lifting-Jack's and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. My invention relates to an improvement in lifting-jacks, the object being to provide a lifting-jack which shall consist of few parts, will not be liable to get out of order, can be quickly adjusted, and which is light, durable, and cheap. l

WVith these ends in view my invention consists in certain features of construction and combinations of parts, as will be fully described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in perspective of the lifting-jack. Fig. 2 is a vertical section. Fig. 3 is aview in side elevation,representing the jack in use. Fig. 4 is a detached view of the ball-joint in position in the head, and Fig. 5 is a view in side elevation of a modification.

A represents the lower section of a telescopicstandard, made of iron or other suitable material. This standard is provided with a base, a, of suitable size and material.

B represents an adjustable section, preferably made hollow, and adapted to fit ithin the section A, and have an easy sliding motion therein. The section B is provided with a 3 5 suitable head, I), either screwed on or attached securely in any. other appropriate manner. The head I) is provided with a slot, 1), adapted to receive the upper end of the arm E and allow this arm a sufficient play therein. 40 upper end of the arm E is ball-shaped and adapted to rest in the top of the sliding section B, in which position it is secured by the head b. The arm E is made smaller than the diameter of the ball shaped end, where it p ass esthrough the slot 1). This arm E is bent outward from the standard near its lower end, as shown at 0. Its lower end is pivoted between the branches f of the bifurcated lever F. The standard A is further provided with a clamp ing-collar, 0, having a projection, 0, which is The pivoted between the upper ends of the branches f of the lever F. The branches f of the lever F are slightly curved, so that the pivotal point of the arm E will fall inside of the pivotal point I of the lever F, when the lever is raised to a po-- 5 5 sition parallel with the standard. Thebranches of the lever F are sufficiently long to allow the curved portion of the arm E to pass between them when the lever is raised. The opening in the clampingeollar O slightly exceeds in 60.

diameter'thatof the standard A, to allow the collar to be readily adjusted on the standard, whichis effected by retaining the collar in a horizontal position. lVhen the lever F is raised, the weight of the object supported by 6 5 the jack is transmitted to one side of the clamping-collar, thereby causing it to tilt and its opposite edges, 9, to grip the standard and be come securely locked thereto. The heavier the weight the firmer will the collar G hold. The lower end of the arm E is, moreover, pivoted in such a position on the lever F that the lever will be centered just before reaching a position parallel with the standard; hence when the lever is pushed beyond this position it will be retained by the weight of the object raised. The lever F may be bifurcated, or it may consist of a single bar, and the arm E bifurcated at its lower end; or, in fact, neither the arm nor lever need be bifur- 8o cated or curved, as shown, it simply being necessary to so construct and connect the lever and arm that when the lever is raised it will move the lower end of the arm transversely past the pivotal point of the lever, and thereby lock the latter against accidental displacement. Still further, the lever F may be pivoted to the collar 0 a short distance from its end, and the arm E have one end pivoted to the end of the lever F, and the other pass 0 through an elongated slot in the standard A and engage the lower end of the sliding sec tion B, in which case the lever F would be depressed in order to lift the weight.

This liftingjack is especially'adapted to the purposes of a wagon-jack; but the head can be readily constructed to take the tongued edge of a board, and it will then be very useful to carpenters in setting up the boards in laying floors.

IOO

It is evident that slight changes may be made in the form or construction of the several parts without departing from the spirit of my invention. I do not wish, therefore, to confine myself strictly to the construction herein set forth; but,

Having fully described my invention, what I claim as new, and desire to secureby Letters Patent, is'- 1. The combination,with the standard and a movable seetion,of an adjustable collar en1- bracing the standard, an arm pivotally secured to the movable section, and a lever piv- Otally secured to the adjustable collar and to the arm, substantially as set fortln 

